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You'll need to directly touch base with his physical therapist and talk about his restrictions. He may not be honest with you and you don't want the liability. Secondly, at first until you fully understand his restraints and healing process keep him on machines or hammer strength. I.e. leg press, quad extensions, ham curls etc. He will feel his limits above and beyond direction from the therapist. Building up the muscle around his knee joints is key to recovery. And stretch, stretch, stretch.
You also may want to consider a product like Biofreeze to apply before and after his workouts.